NGC 6520 is an open cluster in the constellation Sagittarius, superimposed upon the Large Sagittarius Star Cloud. It is magnitude 9.0, diameter 5 arc minutes and class G. It has about 25 stars of magnitude 9 to 12. The dark nebula Barnard 86 lies near its western edge. Both can be seen together just right and above center in this image. These lie close to Baade’s Window, which is an area of the sky with relatively low amounts of interstellar dust along the line of sight from Earth. This area is considered an observational “window” as the normally obscured Galactic Center of the Milky Way is visible in this direction. It is named for astronomer Walter Baade, who first recognized its significance. This area corresponds to one of the brightest visible patches of the Milky Way.

Telescope: Planewave CDK17 (FR) f4.5
Mount: Astro Physics 1600GTO
Camera: QHY16200A/ Integral FW
Guider: Agena Starguide II / ZWO ASI178MM
Filters: Astronomik 36mm LRGB

L: 43×5 mins = 210 mins, R: 21×5 mins = 105 mins, G: 21×5 mins = 100 mins, B: 20×5 mins = 100 mins

Total Imaging Time: 8h 45m

Data Imaged remotely over 10 nights during October 2022.
Imaged from Observatorio El Sauce, Chile, in partnership with Fred Espenak.
Data acquisition & Processing by David Churchill.

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